Android 百度地圖API 定位 導航

           看看這個利用百度地圖定位並實現目的地導航的Demo。

首先看實現效果：

                                 

進 入後首先會獲得當前位置，在地圖上顯示出來。在輸入框中輸入目的地後，就會在地圖上出現最佳線路，我這裏設置的是距離最小的駕車線路，另外還有公交線路、 步行線路，在代碼中都有具體凝視。另外，在控制檯還輸出了線路上每一個節點的信息以及起始位置和目的地的距離，信息顯示的是在當前節點的導航信息。例如如下 圖：

       

 

接下來就看怎樣實現了，首先。註冊百度開發人員帳號，並進入百度地圖API查看相關資料百度地圖API，而後就是爲需要增長地圖的應用註冊APP KEY，註冊完後，下載百度地圖jar文件。新建project。並導入就能夠。如下看實現具體代碼，在代碼中有具體凝視：

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public class NavigationDemoActivity  extends MapActivity {       private String mMapKey =  "註冊本身的key" ;       private EditText destinationEditText =  null ;       private Button startNaviButton =  null ;       private MapView mapView =  null ;       private BMapManager mMapManager =  null ;       private MyLocationOverlay myLocationOverlay =  null ;       //onResume時註冊此listener，onPause時需要Remove,注意此listener不是Android自帶的，是百度API中的       private LocationListener locationListener;       private MKSearch searchModel;       GeoPoint pt;               @Override       public void onCreate(Bundle savedInstanceState) {           super .onCreate(savedInstanceState);           requestWindowFeature(Window.FEATURE_NO_TITLE);           setContentView(R.layout.main);           destinationEditText = (EditText)  this .findViewById(R.id.et_destination);           startNaviButton = (Button)  this .findViewById(R.id.btn_navi);                       mMapManager =  new BMapManager(getApplication());           mMapManager.init(mMapKey,  new MyGeneralListener());           super .initMapActivity(mMapManager);                       mapView = (MapView)  this .findViewById(R.id.bmapsView);           //設置啓用內置的縮放控件           mapView.setBuiltInZoomControls( true );             //設置在縮放動畫過程當中也顯示overlay,默以爲不繪製  //        mapView.setDrawOverlayWhenZooming(true);           //獲取當前位置層           myLocationOverlay =  new MyLocationOverlay( this , mapView);           //將當前位置的層加入到地圖底層中           mapView.getOverlays().add(myLocationOverlay);                       // 註冊定位事件           locationListener =  new LocationListener(){                   @Override               public void onLocationChanged(Location location) {                   if (location !=  null ){                       //生成GEO類型座標並在地圖上定位到該座標標示的地點                        pt =  new GeoPoint(( int )(location.getLatitude()*1e6),                               ( int )(location.getLongitude()*1e6));  //                  System.out.println("---"+location.getLatitude() +":"+location.getLongitude());                       mapView.getController().animateTo(pt);                   }               }           };                       //初始化搜索模塊           searchModel =  new MKSearch();           //設置路線策略爲最短距離           searchModel.setDrivingPolicy(MKSearch.ECAR_DIS_FIRST);           searchModel.init(mMapManager,  new MKSearchListener() {               //獲取駕車路線回調方法               @Override               public void onGetDrivingRouteResult(MKDrivingRouteResult res,  int error) {                   // 錯誤號可參考MKEvent中的定義                   if (error !=  0 || res ==  null ) {                       Toast.makeText(NavigationDemoActivity. this ,  "抱歉，未找到結果" , Toast.LENGTH_SHORT).show();                       return ;                   }                   RouteOverlay routeOverlay =  new RouteOverlay(NavigationDemoActivity. this , mapView);                                       // 此處僅展現一個方案做爲演示樣例                   MKRoute route = res.getPlan( 0 ).getRoute( 0 );                   int distanceM = route.getDistance();                   String distanceKm = String.valueOf(distanceM /  1000 ) + "." +String.valueOf(distanceM %  1000 );                   System.out.println( "距離:" +distanceKm+ "千米---節點數量:" +route.getNumSteps());                   for ( int i =  0 ; i < route.getNumSteps(); i++) {                       MKStep step = route.getStep(i);                       System.out.println( "節點信息：" +step.getContent());                   }                   routeOverlay.setData(route);                   mapView.getOverlays().clear();                   mapView.getOverlays().add(routeOverlay);                   mapView.invalidate();                   mapView.getController().animateTo(res.getStart().pt);               }                               //下面兩種方式和上面的駕車方案實現方法同樣               @Override               public void onGetWalkingRouteResult(MKWalkingRouteResult res,  int error) {                   //獲取步行路線               }                               @Override               public void onGetTransitRouteResult(MKTransitRouteResult arg0,  int arg1) {                   //獲取公交線路               }                               @Override               public void onGetBusDetailResult(MKBusLineResult arg0,  int arg1) {               }               @Override               public void onGetAddrResult(MKAddrInfo arg0,  int arg1) {               }               @Override               public void onGetSuggestionResult(MKSuggestionResult arg0,  int arg1) {               }               @Override               public void onGetPoiResult(MKPoiResult arg0,  int arg1,  int arg2) {               }           });                       startNaviButton.setOnClickListener( new OnClickListener() {                               @Override               public void onClick(View v) {                   String destination = destinationEditText.getText().toString();                                       //設置起始地（當前位置）                   MKPlanNode startNode =  new MKPlanNode();                   startNode.pt = pt;                   //設置目的地                   MKPlanNode endNode =  new MKPlanNode();                    endNode.name = destination;                                       //展開搜索的城市                   String city = getResources().getString(R.string.beijing);  //              System.out.println("----"+city+"---"+destination+"---"+pt);                   searchModel.drivingSearch(city, startNode, city, endNode);                   //步行路線  //              searchModel.walkingSearch(city, startNode, city, endNode);                   //公交路線  //              searchModel.transitSearch(city, startNode, endNode);               }           });                   }               @Override       protected void onResume() {           mMapManager.getLocationManager().requestLocationUpdates(locationListener);           myLocationOverlay.enableMyLocation();           myLocationOverlay.enableCompass();  // 打開指南針           mMapManager.start();           super .onResume();       }               @Override       protected void onPause() {           mMapManager.getLocationManager().removeUpdates(locationListener);           myLocationOverlay.disableMyLocation(); //顯示當前位置           myLocationOverlay.disableCompass();  // 關閉指南針           mMapManager.stop();           super .onPause();       }           @Override       protected boolean isRouteDisplayed() {           // TODO Auto-generated method stub           return false ;       }               // 常常使用事件監聽，用來處理一般的網絡錯誤，受權驗證錯誤等       class MyGeneralListener  implements MKGeneralListener {               @Override               public void onGetNetworkState( int iError) {                   Log.d( "MyGeneralListener" ,  "onGetNetworkState error is " + iError);                   Toast.makeText(NavigationDemoActivity. this ,  "您的網絡出錯啦！ ",                           Toast.LENGTH_LONG).show();               }                   @Override               public void onGetPermissionState( int iError) {                   Log.d( "MyGeneralListener" ,  "onGetPermissionState error is " + iError);                   if (iError ==  MKEvent.ERROR_PERMISSION_DENIED) {                       // 受權Key錯誤：                       Toast.makeText(NavigationDemoActivity. this ,                                "請在BMapApiDemoApp.java文件輸入正確的受權Key！ ",                               Toast.LENGTH_LONG).show();                   }               }           }  }

而後是佈局文件：

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<? xml version = "1.0" encoding = "utf-8" ?>  < LinearLayout xmlns:android = "http://schemas.android.com/apk/res/android"       android:layout_width = "fill_parent"       android:layout_height = "fill_parent"       android:orientation = "vertical" >           < LinearLayout           android:layout_width = "fill_parent"           android:layout_height = "wrap_content"           android:orientation = "horizontal" >               < TextView               android:layout_width = "wrap_content"               android:layout_height = "wrap_content"               android:textSize = "18sp"               android:text = "Destination：" />               < EditText               android:id = "@+id/et_destination"               android:layout_width = "fill_parent"               android:layout_height = "wrap_content" />       </ LinearLayout >               < Button            android:id = "@+id/btn_navi"           android:layout_width = "fill_parent"              android:layout_height = "wrap_content"              android:text = "Start navigate" />           < com.baidu.mapapi.MapView           android:id = "@+id/bmapsView"           android:layout_width = "fill_parent"           android:layout_height = "fill_parent"           android:clickable = "true" />      </ LinearLayout >

AndroidMainifest.xml：

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<? xml version = "1.0" encoding = "utf-8" ?>  < manifest xmlns:android = "http://schemas.android.com/apk/res/android"       package = "com.ericssonlabs"       android:versionCode = "1"       android:versionName = "1.0" >           < uses-sdk android:minSdkVersion = "8" />           < uses-permission android:name = "android.permission.ACCESS_NETWORK_STATE" ></ uses-permission >       < uses-permission android:name = "android.permission.ACCESS_FINE_LOCATION" ></ uses-permission >       < uses-permission android:name = "android.permission.INTERNET" ></ uses-permission >       < uses-permission android:name = "android.permission.WRITE_EXTERNAL_STORAGE" ></ uses-permission >       < uses-permission android:name = "android.permission.ACCESS_WIFI_STATE" ></ uses-permission >         < uses-permission android:name = "android.permission.CHANGE_WIFI_STATE" ></ uses-permission >        < uses-permission android:name = "android.permission.READ_PHONE_STATE" ></ uses-permission >               < supports-screens android:largeScreens = "true"           android:normalScreens = "true" android:smallScreens = "true"           android:resizeable = "true" android:anyDensity = "true" />       < uses-sdk android:minSdkVersion = "3" ></ uses-sdk >           < application           android:icon = "@drawable/ic_launcher"           android:label = "@string/app_name" >           < activity               android:name = ".NavigationDemoActivity"               android:label = "@string/app_name" >               < intent-filter >                   < action android:name = "android.intent.action.MAIN" />                       < category android:name = "android.intent.category.LAUNCHER" />               </ intent-filter >           </ activity >       </ application >      </ manifest >